Located opposite Peniche, the Berlengas Archipelago consists of 3 groups of small islands: Berlenga Grande (the only inhabited one, that can be visited by boat from Peniche) and the nearby reefs, Estelas and Farilhões-Forcadas; their geological nature is different from that of the Portuguese coast.

The Islands have their own particular fauna and flora, with characteristics that make their ecosystem unique in the world, the importance of which was recognised by the creation of the Berlenga Nature Reserve in 1981.